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Foreign Currency Forward Contracts
9 Months Ended
Jul. 31, 2011
Foreign Currency Forward Contracts [Abstract]  
FOREIGN CURRENCY FORWARD CONTRACTS
(13) FOREIGN CURRENCY FORWARD CONTRACTS
     From time to time, Ciena uses foreign currency forward contracts to reduce variability in certain forecasted non-U.S. dollar denominated cash flows. Generally, these derivatives have maturities of 12 months or less and are designated as cash flow hedges. Ciena considers several factors when evaluating hedges of its forecasted foreign currency exposures, such as significance of the exposure, offsetting economic exposures, potential costs of hedging, and the potential for hedge ineffectiveness. Ciena does not enter into derivative transactions for purposes other than hedging economic exposures. Beginning in the second quarter of fiscal 2011, Ciena entered into forward contracts to reduce the variability in its Canadian Dollar and Indian Rupee denominated expense, which principally relate to research and development activities. These derivative contracts have been designated as cash flow hedges and are immaterial for separate financial statement presentation.